dma.c File Reference

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <asm/io.h>

Go to the source code of this file.

Functions
void *	dma_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
void	dma_free_coherent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)

Function Documentation

void* dma_alloc_coherent	(	struct device *	dev,
		size_t	size,
		dma_addr_t *	handle,
		gfp_t	gfp
	)

dma_alloc_coherent - allocate consistent memory for DMA : valid struct device pointer, or NULL for ISA and EISA-like devices : required memory size : bus-specific DMA address

Allocate some uncached, unbuffered memory for a device for performing DMA. This function allocates pages, and will return the CPU-viewed address, and sets to be the device-viewed address.

Definition at line 19 of file dma.c.

void dma_free_coherent	(	struct device *	dev,
		size_t	size,
		void *	cpu_addr,
		dma_addr_t	handle
	)

dma_free_coherent - free memory allocated by dma_alloc_coherent : valid struct device pointer, or NULL for ISA and EISA-like devices : size of memory originally requested in dma_alloc_coherent : CPU-view address returned from dma_alloc_coherent : device-view address returned from dma_alloc_coherent

Free (and unmap) a DMA buffer previously allocated by dma_alloc_coherent().

References to memory and mappings associated with cpu_addr/handle during and after this call executing are illegal.

Definition at line 42 of file dma.c.